ILE Exam Hearing Aids Correct 100%(RATED A+)

Hand Cupped Behind Ear - ANSWER -first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 - ANSWER -carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone type hearing instrument 1920 - ANSWER large vacuum tubes; not portable 1938 - ANSWER miniature vacuum tube ;crystal receivers 1930 - ANSWER diameter reduced 1940 - ANSWER bone conduction receivers were introduced 1946 - ANSWER first telecoil introduced 1950 - ANSWER bodyworn HA became convenient size 1948 - ANSWER transistor invented 1954 - ANSWER eyeglasses aids introduced 1974 - ANSWER microphones electrets were introduced 1964 - ANSWER intergrated circuit(transistors, resistors, wiring...) 1952 - ANSWER first transistors The Most Important function of the oval window is to : - ANSWER transfer vibration from the ossicular chain Hair Cells a rise from the layer on top of the : - ANSWER organ of corti The theory of hearing that is considered the most accurate is : - ANSWER Place Theory, Volley Theory, Temporal Theory The Three semicircular canals are: - ANSWER 1)90degress angle to one another 2)superior,posterior, and lateral 3)detectors of rotational movement in any direction